Whether this number is positive infinity or negative infinity.
Only satisfied by double.infinity and double.negativeInfinity.
All numbers satisfy exactly one of isInfinite, isFinite and isNaN.
bool get isInfinite;
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Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-core/num/isInfinite.html